Please help me!
The volume of a block of wood equals 78 cm^3 What is its volume in cubic inches?

Question

Please help me! 
The volume of a block of wood equals 78 cm^3 What is its volume in cubic inches?

anonymous · Answer

2.54cm / inch
78cm^3*(1 inch/2.54cm)^3
The cm cancel out
=78/(2.54^3)

steve816 · Answer

I don't think that is right...

anonymous · Answer

Stoichiometry has a fancy name but it's very easy. Just like $$\frac{ 1 }{ 2 }*\frac{3}{3} = \frac{3}{6} $$
You are multiplying your value by 1, because the value of numerator equals the denominator.
And just keep doing it so units cancel out to the ones you want to result to.

2.54 cm = 1 inch

and you keep canceling the cm until you get in^3 (and not 1/in^3)

anonymous · Answer

$$78cm^3\frac{ 1 inch }{ 2.54cm }\frac{1 inch}{2.54cm}\frac{1inch}{2.54cm}$$

anonymous · Answer

It's correct. If you have cm in the numerator and multiply it by something that has cm in the denominator, the cms cancel out.

anonymous · Answer

Thanks kestry, it's tough entering fractions on a phone

steve816 · Answer

Thanks everyone for the help :) I think I understand it now!

anonymous · Answer

Haha, you answered the question so fast and well!

anonymous · Answer

Woo, thanks steve! Good luck on the rest of your hw

steve816 · Answer

Thanks kestry! By the way, what are you working on kestry?

anonymous · Answer

I'm working on Calculus /cry